Compressor.



i To all' whom' fit ma/y utilize I sTAfrEs PATEN'i' onFioi-i.

JOHN Da'ocnnnzrr mnrnn'w, or Acrrnizriat, rnxns, Assrenon CoroNE-el'xfrn ".ro JoBN I.. Boom, or rYLnn, wnxAs, oNn-six'rn 'ro PAUL a.WHALY Ann oN-sm'rfi '1'0 WILLIAM I.. MARTIN, no'rn or MAnsHALL, Texas,.um oNE-sIx'i'H 9:0 CLEB W. .i

DAWLEY, or mnnns'rnn, OKILAHOMA.

i Speelcation of Letters Patent.

Patented Apr; 19, 1910.

v Applicationmed January 13, 1909, Serial No. 472,186. Renewed March 15,1910. Serial` Ro. 549,442.

cenowa/i:- Be it -known that I, JOHN4 DAUGHERTY MAYHEW, a citizen of theUnited States,l

and a re'sident of Tyler, in the county of Smith and State of Texas,have invented a new and Imp-roved Compressor, of which the following isa full, clear, and exact description. I

This invention relates to compressors employed. in'connecton withammonia, ice or refri'erating machines l'that compress the gas rom thecoils into the condenser.

One obyeot of the invention is to produce a. compressorhaving an-improved construction whereby-the maximum amount of gas or vapor may hecom ressed.

A ,further object is to provide al compressor in which the heat evolvedduring the operation of compressing the gas or vapor may be utilized todry the incoming gas' I A fui'ther object is. t'o provide means whereythe mco'ming gas orv vapor may be 'to cool the 4walls of theVcompressioncylinderl' f i A still further. object is to provide meansfor preventing liquid from being conveyed i i to the cylinder by the gasor vapor.

The invention consists in the construction and combination of parts tobe more fully' described hereinafter. and particularly set forth in theclaims.

- Reference it to be'had' to the accompanying drawings forniing. a partof this specification, in which similar characters of referenceindi-cate corresfionding parts inall the views, and in' whi'c Fi'gure 1`is. a 'central Vertical section through the compressor; Fig. 2 is ahorizontal section taken on the line 2-2 in Fig. 1; and Fig. 3 is ahorizontal section taken on i 'the line 3-3 in Fig. 1,

Inrsaia drayvmgs, the body'of. the cemw pressor comprises two.'concen-tric cylinders,

1 and 2, ,which may nbe.\'inited by bolts at their u per ends. Saidcylinders are separated y an annular space-i.. A; plurality ides 6 areformed on the I the. outer cylinder for the vceiitering the lower end ofthe inof projections or,

-purpose o rnei' cylinder. n inlet 8 is frmed near theupper end of theouter cylinder 1 and communicateswith an annular recess 1,0, the

outer cylinder having a' flange 12 projecting upwardly from its inneredge. The purpose of this flangeis to entrap any liquid 'which may beconveyed to the 'compressor by the as or vapoi' entering the inlet 8` Ac 'inder head 15 is bolted to the lower end o Vthe cylinder 1, and isprovided at its outer edge with an upturned di'ip flange 16. A chamber18 is formed at the center of the cylinder head 15, and the u per end 20of said cliamber is raised slight y above the inner face of' thecylinder head 15. This forms an annular' space or trap at the bottom ofthe cylinder 1, which will recelve any liquid which may have escapedover the fiange 12 and reached the bottom of said cylinder. 'This willprevent the liquid from coming in contact with the lpiston rod 22 andcausing the same to become clogged. The chamber 18 ma be filled withoil,

- which may besupplie .through a pipe 24.

The walls' of the chamber 18 are prolon ed downwardl to form the wallsof a stu ng box 26. ackin -27 surrounds the piston rod 22, and is he din position by a gland 28, which is in turn held by a nut .30. The lowerend of the nut 30 is screw- .threaded at 31, to receive a cup 32, withinwhich suitable paeking 34 may be hold to catch any oil which may tend tocreep down along the piston rod. 22. f

i The compressor cyhnders are mounted upon a frame or support 38, whichis bolted -to 'the lower end of the outer cylinder.

Within the cylinder 2 is a piston 40, having a central boss'42 which isconnected to. the outei' ortion of the piston by webs 4.3.'- The cylinrical portion of the piston is provided with grooves, within whichpacking rings 44-are retained. At theupper end of the piston 40 is anannular valve seat 46 secured to the end' of said piston by means ofbolts,

vSaid valve seat is provided with a conical openin for reoeiv theconical end of a valve d 48. Sdi f valve body 48 i's pro.-

'vided Wit i depending webs 49 spaced apart and' preferably four innumber, the webs each having. a shoulder 50 formed `at its lower end.The webs 49 form a guide for the valvebody and the pur ose of theShoulders 50' 'is to revent the va ve body from ''ismg too far a ve itsseat, the Shoulders 5'0 com.- ing in contact with the under side of apackwhich is surrounded by to aid the admission of gas to the upper sideof the piston when said 'piston 'is movedg downwardly. When the valve 48is lifted from its seat, the gas passes between the webs 49.

The cylinder` 2 is provided with a Hseries of ports 58, which arelocated a suificient distance above the lower end of said cylinder .toenable the piston 40 to come below` them, as shown in the dotted-lineposition in Fig. 1, and thei'eby allow the vapor to pass from theannular 'chamber 4 through ports 58, thereby filling the cylinder 2withl gas of the same pressure as that` in the chamber 4.

The upper end of the cylinder 2 is prolonged integrally by a cylindricalvalve casing 60, having an outlet ort 61 formed in one side thereof. Acy inder head 62 is bolted to the upper end of the casing 60, and

j at the bottom of the valve casin ma be provided With a clearing pipe63. A alse cylinder head 65 is slidably mounted t d O v 60 am red-l ainem' proper position by gui es 66.' ai

false cylinder head is providedv with 'a' central valve seat 67, adaptedto receive a valve body 68. Said valve body is provided with anlupwardly extending hollovi7 boss 69 for the reception of a spring 70.Said spring rests against the bottom ofthe cavity in `the-boss 69, andalso against the inside of the top'of .a hood 72, which forms a guidefor the boss 69. Saidv hood '72 is formed with a'n annular flange 74 atits. base, which flangel bears against the'upper face of the valve seat67, and is retained in position by bolts, assin through said flange andinto the fa se cyhnder head 65. Springs'? 6 rest upon the upper surfaceof the fiange 74, and

` `theirupper'ends surround .'lugs 78 fornied aperture's .80, whichallow the as to escape' on the inner face of the cylinder head 62:

The hood 72 is provided with. av series of I fromsaid hood into the chamer 64 When the valve body 68 lis raised from its seat.

From the construction'-above'set fortlr, it

will be seen that the gas or' vapor coming `'through theinlet 8 willcome in'contact with 'the flange 12, and vany li uid conveyed 'by saidgas will entrapped ehind said fiange m the' chamber 10. The vaporpassing'over said flan e intof the annular chainber4 will be heate anddried'by' coming in contact I 'with -the walls of the inner cylinder 2,whicl has become heated throu h the compression of gas within the same.s

' the vaportravels downwardly through said Chamber 4 .and

rea'ches the lower end ofthe cylinder 2, it

operates to cool the lower end of said cylinder much more effectivelythan would be 'done by cooli'ng water. The heated vapor will evaporatethe liquid in the trap 10 and will also tend to evaporate that'whichmay.

be held in the lower trap 16 at thefbottom of said'cylinders. The valve48 is nearly balanced, and When it reachesits lowest position., asshownin dotted lines in Fig. 1, the vapor pressure` above the piston 40will be equalized, since free communication `is afforded between theChamber 4 and the in- -terior of the cylinder 2 by means of the Thelupward movement of the ports '58.

iston 40 compresses the gas within the cylinder 2 and forces it throughthe valve 68 and out of the ports 80 through the outlet 61, as is'readily understood. From this construction, it will be seen that thecylinder 2 will be-,filled with the gas at a low temperature, andl agiven diplacement will handle a large amount of gas. f

Having thus described my invention, I

claim as new and desire to secure by LettersPatent:--' i 1. In acompressor, the combination' of two concentric 'cylinders forming anannular Chamber therebetween, the outer of which is f provided with anannular channel and 'an' inlet communicating therewith,` a 'series ofand arraned 'to go below said ports, a valve in the en oflsaid piston, alvalve .chamber above said cylinders, a valver in the base of Vsaidchamber, rand an Outlet said valve Chamber. f 2. In a compressor, thetwo concentric cylinders, united at their upcombination of.

ports in the walls of theinner cylinder, a piston moving within saidinner cylinder.

per ends and forming an annular chamber' thereb'etween, a recess formedwithin the `outer cylinder near the upper end thereof .and havin anannular flange at one edge thereof, guides for separating said cylindersat their lower ends, ports in the walls of said inner cylinderintermediate the length thereof, a, piston within 'said inner `cylinder'adapted to move -below said ports, and means whereby' the" gas'may bedischarged from the. compressor.

In a compressor, the combination'of a pair of concentric cylinders,separated to orm an annular chamber therebetween and united v'at theirupper ends, a trap formed at theupper end of theouter cylinder, a clinder head secured' to the lower end o 'the outer-cylinder and providedwith an upturnedv drip flange, a'central boss extending .upwardly fromsaid cylinder head and form- 'ing an annular space or trap in saidcylinder head, the| said boss being provided with a 'central aperturefor a piston rod, an oil chamber -formed iii said vcylinder head,

means for admitting gas to said cylinders, and means for discharging thegas therefrom.

4. In a compressor, the combination of a pair` of Concentric cylinders,separated. to form an annular Chamber therebetween, a piston arranged totravel within the inner cylinder and having a valve body provided withdepending webs and a depending central stem, the said webs each having4'a shoulder at its lower end, a spring surrounding said stem andtending to raisesaid valve body, a packing ring secured in a recess inthe inner face of the wall of the piston at the upper end thereof, andadapted to be enga'ged by the Shoulders of said webs t'o limit theupward movement` of the valve' body, a valve Casing above saidcylinders, and a valve in said Casing.

5. In a compressor, the combination of a pair of verticalzconcent-riccylinders, a trap .formed at the upper end of said cylinders, .a

trap at the lower end of said cylinders, means for-* supplyinggas tosaid cylinders, means' fornoompresslng the gas, and means fort'ischarging the Compressed gas. i

6. `In a compressor, the combination of a pair of Vertical Concentriccylinders, sep- .arated to form an 'annular Chamber therebetween, atrap' at the u per end of said Chamber, means for supp ying gas to saidcylinders, means 'for compressing the gas,

.and means for discharging the gas.

7. Ina compressor, the combination With an oute'r cylinder provided withan inlet near its uppere'nd, of an inner cylinder spaced from thell'outer Vcylinder to form an annular Chamber, said Chamber, the innercylinder being united toithe upper end of the outer cylinder and havingat its upper portion an integral Cylindrical extension provided at itsupper end with a cylinder head, the said extension of the inner cylinderforming a valve Chamber, the said Chamber being provided with an'outlet,a series of ports in the l'walls of the inner cylinder opening into thesaid annular Chamber between the cylinders, a piston Within 'the saidinner cylinder and arranged to move below the said ports, a valve m theend of the piston, and a valve in the said valve Chamber.

8. In a compressor, the combination With the compressor Cylinders andmeans for sup- Springs held in the valve casing a trap at the upper endof` head slidably mounted at the -bottom of the' valve casing andprovided with a central valve seat, avalve Coperating with said seat andprovided with an upwardly extending hollow boss, a hood above said valveforming a 'guide for the boss, the said hood having an annular flange atits base bearing against the upper face of the valve seat and secured tothe said head, a s ring held within said hood and said ho low boss,

an'd bearing against the flan e of the hood, the said hood being providewith a series of apertures for the escape of gas into the valve casingWhen the valve is raised, and means for Compressin the gas and forcing1t through the sai valve. i

'9. In 'a compressor, the combination wlth the Compressor cylinder andmeans for supplying gas to said cylinder, of a hollowpiston arranged totravel in said cylinder to compress the gas, the said piston having aCentral boss connected by webs to the outer portion of the piston, anannular valve seat removably secured to the end of the piston andprovided with a Conical opening, a valve body having a Conical end for'."e gaging the valve seat, the said valve body being provided with adepending stem and also provi'ded with depending webs each having ashoulder at its lower end, a spring surrounding said stem and bearingagainst the upper face of the said boss and the under side of the valvebody, the said spring tending to lift the valve body from its seat, apackmg ring fitting in a recess in the inner face of the wall of thepiston at the upper end thereof and engaging the lower face of the saidvalve seat, the said packing rin beinflr adapted to be engaged by thesai Shoulders of the webs to hmit the upward movement of the valve body,and means for (lischarging the Compressed gas from said' cylinder. o

In witness whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN DAUGHERTY MAYHEW; I

' Witnesses: O. M. Bovnn, Fommsr MA'rms.

